Crop straw co-fermentation device

Abstract

The invention discloses a crop straw co-fermentation device. The crop straw co-fermentation device comprises a pre-treatment reaction tank and an anaerobic fermentation tank, wherein materials in the pre-treatment reaction tank enter the anaerobic fermentation tank by virtue of a discharge pipe of the pre-treatment reaction tank. The pre-treatment reaction tank can carry out aerobic, micro aerobic or anaerobic pre-treatment on crop straw, so that degradation of lignocellulose can be promoted; meanwhile, the materials in the pre-treatment reaction tank and biological metabolism heat can be transferred to the anaerobic fermentation tank by virtue of a packing auger formed by combining a spiral stirrer with the discharge pipe of the pre-treatment reaction tank, so that high-efficiency conversion of straw anaerobic fermentation is realized; besides, leachate and biogas slurry can be recycled and are used for spraying, so that environmental pollution is reduced. The crop straw co-fermentation device can greatly improve biogas production potential of biological straw, increase biogas production efficiency of anaerobic fermentation, shorten a fermentation period and reduce energy consumption of the anaerobic fermentation and is simple in structure and easy to realize.

Description

technical field [0001] The invention relates to a straw resource utilization device, in particular to a crop straw combined fermentation device. Background technique [0002] my country is a large agricultural country, and the annual output of crop straw is about 700 million tons. Due to technical and social reasons, the effective utilization rate of crop straws is less than 30% of the total output, and most of the crop straws are piled up in the fields to rot naturally or be directly burned on the spot, which not only causes serious environmental pollution, but also causes a huge waste of resources. Therefore, increasing the comprehensive utilization of crop straw is of great significance to make up for the shortage of resources in our country and promote the sustainable development of agriculture. [0003] Anaerobic fermentation is one of the most effective methods for processing crop straw. Through the metabolism and energy conversion of microorganisms, low-grade energy ...

AI Technical Summary

Problems solved by technology

[0004] The more mature pretreatment methods in the current straw pretreatment technology include mechanical method, acid method, alkali method, heat treatment, biological method and their combination, but most of these methods are different in technology, equipment, environmental impact and capital consumption. degree of disadvantage

In the traditional straw biogas fermentation process, the pretreatment device and anaerobic fermentation device are two separate systems, which cannot realize continuous fermentation, the fermentation process is not easy to control, the fermentation cycle is long, and the gas production efficiency is poor

At the same time, due to the lack of mass transfer and heat transfer process between the separated pretreatment device and anaerobic fermentation device, a large amount of heat generated by the raw material in the pretreatment stage cannot be used, resulting in a waste of energy

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